When using SVC 188.8.131.52 - 184.108.40.206, the data rates published for FlashCopy background copy and cleaning rate are incorrect for maps which use a non-default (64KB) grain size.
The following table provides the relationship of the FlashCopy background copy and cleaning rates to the user specified rate when using SVC 220.127.116.11 - 18.104.22.168:
|User specified value||Data copied/sec|
with 256 KB grain size
with 64KB grain size
|1-10||128 KB||32 KB|
|11-20||256 KB||64 KB|
|21-30||512 KB||128 KB|
|31-40||1 MB||256 KB|
|41-50||2 MB||512 KB|
|51-60||4 MB||1 MB|
|61-70||8 MB||2 MB|
|71-80||16 MB||4 MB|
|81-90||32 MB||8 MB|
|91-100||64 MB||16 MB|
These values represent the rates which an SVC cluster tries to achieve in an optimal environment, where there are no performance constraints.
Resolving The Problem
This issue was resolved in the 22.214.171.124 release of the SAN Volume Controller software, where a given user specified rate achieves the same data rate independent of the grain size used for the mapping.
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Wording Provider - Chris Canto
Related to VRM's - 126.96.36.199 - 188.8.131.52, fixed in 184.108.40.206
Defects / work items - 112139 (to publish the technote)
First Review Date - 08/02/2010 - first publish
Last Review Date - 18/05/2010 - republished to state fixed in 220.127.116.11 PTF
Reviewed By - Steve White, Chris Beeken
23/09/2010: EH/ GL reviewed. This document relates to SVC V5.1.x and earlier only.
17 June 2018